f(x)=√3sinxcosx+sin²x 【sin2x=2sinxcosx、cos2x=1-2sin²x】
=(√3/2)×[2sinxcosx]+(1/2)[1-cos2x)
=(√3/2)sin2x-(1/2)cos2x+(1/2)
=sin(2x)cos(π/6)-cos2xsin(π/6)+(1/2)
=sin(2x-π/6)+(1/2)sin²x 应该怎么变换得 (1/2)[1-cos2x)cos2x=1-2sin²xcos2x-1=-2sin²x2sin²x=1-cos2xsin²x=(1-cos2x)/2
